When you ask "What number is halfway between 72 and 138?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=72 and Y=138.
To find the number halfway between 72 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 138 into our formula, we get:
(72 + 138)/2 = 105
Thus, the number halfway between 72 and 138 is 105.
To check that our answer is correct, we subtract 72 from 105 and subtract 105 from 138 and compare the two numbers:
105 - 72 = 33
138 - 105 = 33
As you can see, the halfway number is 33 higher than 72 and 33 lower than 138. Therefore, our halfway between answer of 105 above is correct.
Halfway Between
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Halfway Between 72 and 139
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